Synthesis and spectral studies of novel nicotinonitrile-based fluorescent dyes

The synthesis of novel highly efficient fluorescent dyes of 4-amino-2-chloro-6-arylpyridine-3,5-dicarbonitrile series via heterocyclization of aryl(heteryl)methylidene derivatives of malononitrile dimer bearing electrondonor groups was described. Solvatochromic behavior and substituents effect on the spectral-luminescent properties were also investigated. Strong solvatochromism and high relative fluorescence quantum yields up to 0.92 despite the large Stokes shift values and were observed.

Automated summary

The synthesis of novel highly efficient fluorescent dyes was described via heterocyclization of aryl(heteryl)methylidene derivatives of malononitrile dimer bearing electrondonor groups. Solvatochromic behavior and substituents effect on the spectral-luminescent properties were investigated, with strong solvatochromism and high relative fluorescence quantum yields observed despite large Stokes shift values.